Sekulow cited testimony by Comey earlier this month that the president wasn't a target of an investigation.

"Sekulow added that the president has not received any notification that he is being investigated".

A lawyer for Mr Trump legal team later asserted the President is not under investigation, despite the the tweet.

Trump is not being served well by either man, and with his presidency possibly hanging in the balance of Mueller's probe, he must regain control of the Justice Department.

Sekulow said that Trump's comment was specifically in response to a Washington Post story, quoting unnamed sources familiar with the Muellerinvestigation, as saying that Mueller was probing whether Trump obstructed justice in firing Comey.

"As he helped introduce Trump here Friday on a podium bearing the presidential seal, Rubio spoke in a volume and cadence reminiscent of the speeches he delivered as a candidate for president", the Postreported.

Friday is the deadline set by the House Intelligence Committee for the White House to produce "any White House recordings or memoranda of Comey's conversations with President Trump (that) now exist or have in the past".

"I can not read the mind of the special prosecutor", Sekulow said."No one has notified us that he is" under investigation, Sekulow said.

Deputy Attorney General Rod Rosenstein may be recusing himself from the DOJ's Russian Federation investigation.

Senator Marco Rubio, who lost the Republican primary election to Trump, called for a "full and credible investigation".

On Friday, the president wrote the opposite on Twitter, saying: "I am being investigated for firing the Federal Bureau of Investigation director by the man who told me to fire the Federal Bureau of Investigation director!"

After those reports, Trump himself had once again resorted to Twitter, where he posted an enigmatic message on Thursday in which he seemed to acknowledge that he was under investigation.

"Trump has a compulsion to counter attack and is very pugnacious", Gingrich said on ABC's "This Week" on Sunday.

Adam Schiff, the top Democrat on the House intelligence committee, defended Mueller and his team, noting that lawmakers from both sides of the aisle have praised his appointment.

One of the toughest jobs in Washington, going on two years now, has been appearing on political talk shows to defend Donald Trump's public statements when they conflict with annoying things like objective facts, Trump's own previous statements, or the statements of his cabinet members and White House staff. The California congressman said that the president and his associates are engaged in a scorched earth litigation strategy that begins with discrediting Mueller. What is clear is that he could order the Justice Department to ax Mueller, which may result in Rosenstein's departure and would certainly intensify the uproar over the investigation.

A U.S. official who is familiar with the rough outlines of the probe and who spoke on condition of anonymity told Reuters on Thursday that Mueller was also examining whether Trump or others tried to interfere with the investigation. The president has directed some of his frustration at Deputy Attorney General Rod Rosenstein and Mueller.